FileServer.c

/*Implementation Of Client Server Model*/
/*Group members : Parth Naik - 201001185*/
#include<fcntl.h>
#include<sys/types.h>
#include<sys/socket.h>
#include<netdb.h>
#include<stdio.h>
#include<stdlib.h>
#include<string.h>
#include<strings.h>
#define SERVERPORT 8888
#define MAXBUF 1024

int main()
	{
	int socket1,socket2;
	int addrlen;
	struct sockaddr_in xferServer, xferClient;
	int returnStatus;

	/*Change the path of makelist.sh accordingly*/

	system("/home/blademaster/Desktop/makelist.sh");
	
	/* create a socket */

	socket1 = socket(AF_INET, SOCK_STREAM, 0);
	if (socket1 == -1)
		{
		fprintf(stderr, "Could not create socket!\n");
		exit(1);
		}

	/* bind to a socket, use INADDR_ANY for all local addresses */

	xferServer.sin_family = AF_INET;
	xferServer.sin_addr.s_addr = INADDR_ANY;
	xferServer.sin_port = htons(SERVERPORT);
	returnStatus = bind(socket1,(struct sockaddr*)&xferServer,sizeof(xferServer));
	if (returnStatus == -1)
		{
		fprintf(stderr, "Could not bind to socket!\n");
		exit(1);
		}
	returnStatus = listen(socket1, 5);
	if (returnStatus == -1)
		{
		fprintf(stderr, "Could not listen on socket!\n");
		exit(1);
		}
	
		/* get the filename from the client over the socket */
		
		int fd;
		int i, readCounter, writeCounter;
		char* bufptr;
		char buf[MAXBUF];
		char filename[MAXBUF];

		/* wait for an incoming connection */

		addrlen = sizeof(xferClient);

		/* use accept() to handle incoming connection requests */
		/* and free up the original socket for other requests */
		

		for(;;){

		socket2 = accept(socket1, (struct sockaddr*)&xferClient, &addrlen);
		if (socket2 == -1)
			{
			fprintf(stderr, "Could not accept connection!\n");
			exit(1);
			}

		/* get the filename from the client over the socket */

		i = 0;
		if ((readCounter = read(socket2, filename + i, MAXBUF)) > 0)
			{
			i += readCounter;
			}
		if (readCounter == -1)
			{
			fprintf(stderr, "Could not read filename from socket!\n");
			close(socket2);
			continue;
			}
	filename[i+1] = '\0';
	printf("Reading file %s\n", filename); 

	/* open the file for reading */

	fd = open(filename, O_RDONLY);
	if (fd == -1)
		{
		fprintf(stderr, "Could not open file for reading!\n");
		close(socket2);
		continue;
		}

	/* reset the read counter */

	readCounter = 0;

	/* read the file, and send it to the client in chunks of size MAXBUF */

	while((readCounter = read(fd, buf, MAXBUF)) > 0)
		{
		writeCounter = 0;
		bufptr = buf;
		while (writeCounter < readCounter)
			{
			readCounter -= writeCounter;
			bufptr += writeCounter;
			writeCounter = write(socket2, bufptr, readCounter);
			if (writeCounter == -1)
				{
				fprintf(stderr, "Could not write file to client!\n");
				close(socket2);
				continue;
				}
			}
		}
	close(fd);
	close(socket2);
}
close(socket1);
return 0;
}